Improvement in cream-pumps



M. A. RICHARDSON.

Cream Pump, v No. 36,530. Patented Sept. 23. 1862.

' Eva/0hr @maa- S ul irmzdtrr UNITED STATES PATENT OFFICE.

M. A. RICHARDSON, OF SHERMAN, NEW YORK.

iMPROVEMENT IN CREAM-PUMPS.

To all whont it may concern:

Be it known that I, M. A. RICHARDSON, of Sherman, Chautauqua county,State of New York, have invented a new Cream-Pump; and I do herebydeclare thatthe following is a full and exact description thereof,reference being had to the accompanying drawings and to the letters ofreference marked thereon.

The nature of my invention consists in forcing cream through one or morewire screens before churning it to break and thoroughly disunite theparticles of cream that usually unite and become tough on the surfacewhile standing in vessels.

To enable others skilled in the art to make and use my invention,l willproceed to describe its construction and operation.

Figure 1 is a vertical section of my invention, showing the interior ofthe cream-pump and its general formation. Fig. 2 is a horizontal view ofa wire-cloth screen, a section of which is seen on the lower end of thepump in Fig. 1.

In Fig. 1,A Aisabench orplatform mounted on three legs, B B B.' The pumpstock 0 0 passes through the bench A A and is fastened to it. D is thebore or opening in the pump. E is a piston with packing around it. F isa lever by which the piston is operated. G is a spout from which thecream is discharged. H is a valve on the end of the spout. I is a valvethat opens upward in the pump.

K represents three sci eens placed in the rear endofthespoutG,audareheld there byashoulder in front and a rubber-ring, whichfits tightly in the tube behind them. These screens are made byfastening a circular piece of wire cloth to a flat metallic ring. Thewire on the ring first inserted is quite fine, thesecond is not so fine,and the third is coarser than the second. Thesescreensareseparatedfromeach other by intervening metallic rings.

M represents three wire screens made of the same material as those at K.The wire is fastened to metallic cups of different sizes, so as to fitinto each other, and are then slipped or forced onto the lower end ofthe pump.

Fig. 2 is a horizontal view of the screens and cups seen at M in Fig. 1.

I will now describe the operation of my cream'pum p.

When the piston E is raised by lifting the lever F,a vacuum is formed inthe bore of the pump D. The air cannot enter at the spout G to fill theempty space, because the valve I-I excludes it by fitting tightly on theouter end of the spout. The lower end of the pump at M, being immersedin the cream, prevents the air from entering at that point; but theatmospheric pressure will cause the cream to pass upward through thescreens at M to fill the empty space. When the piston is forceddownward,the valve I closes and a part of the cream above the valve isforced out through the Wire screens at K into the spout G, from which itcan be discharged into any desired vessel. It is clearly seen that everytime the piston E is raised a quantity of cream will rise up through thewire screens at M to fill the empty space above the valve I. It isequally clear that every downward stroke of the piston will force aquantity of cream out through the screens at K. The meshes of the finestscreen at K are about twenty-five thousand to a square inch. The otherscreens are not so fine, but are a support to the fine wire and aid verymuch in disintegrating the tough substance that forms on the top orsurface of milk or cream.

It is well known to many now engaged in the manufacture of butter thatthe tough top coating of cream is not converted into butter by theordinary mode of churning, but remains in the milk and butter, and iscalled by butter-manufacturers white flakes or creamspecks.Thenon-conversionofthese cream flakes into butter is not only a positiveloss of cream, but imparts a bad taste to fresh butter and brings onrancidity in a very short space of time, both of which evils are removedby my inventiomand a further good result obtained which at first I didnot contemplate. find by experiment that the globules of cream or littlesacks that contain the butter are completely broken by being forcedthrough the wire screens, and when the cream is put into a churn it isonly necessary to agitate it to gather the butter.

To break the globules of cream or little sacks that contain the butteris the object aimed at by all modes of churning, and I firmly believethat my method accomplishes it more effectually than any other, and inaddition completely disintegrates the tough covering found on thesurface of milk and cream, which has heretofore greatly injured theappearance, taste, and keepingrqualities of butter.

The screen M can be removed from the end of the pump and the cupsseparated and cleansed, and can easily be replaced again when desired.The screens K can be taken out by unscrewing the spout G from the pumpand removing the rubber ring that is in the rear end of the spout.

Having thus fully described and represented my invention, what I claim,and desire to se cure by Letters Patent, is-

Ihe use of the wire screens M and K,or their equivalents, incombinationwith the spout G, valves H and I, pump-stock G O, lever F, and piston E,in the manner and for the purposes specified.

In witness that I claim the foregoing I have hereunto set my hand in thepresence of two witnesses.

M. A. RICHARDSON.

Witnesses:

\VILLIAM H. KEELER, SYLvENUs H. MYRI'oK.

